<div class="app">
  <!--
    logo
  -->
  <app-titlebar></app-titlebar>

  <!--
    内容正文路由
  -->
  <div class="warpper">
    <nz-root>
      <router-outlet></router-outlet>
    </nz-root>
  </div>
  
  <!--
    tabbar
  -->
  <app-tabbar></app-tabbar>
</div>